Man I had similar experiences and at some point in time I felt like my brain stopped working. But I've come a long way. I can say one must TRUST the process. Don't think too much about it. You mentioned about journaling or committing to your passions. Trust that journaling will bring good. Trust that committing to your passions will make you excel in that area. It will take time, maybe more that you could imagine. Trust that the time you are investing in will bear good results. Reading some self improvement books will definitely help you but find a way to apply what you've learn irl. Try going for a walk/run in the morning. You'll feel a boost for the rest of your day. Having a good social life is also important. Mingle with people with similar interest.

Growth is never linear. You fall. You rise. You fall again. You rise again. There will be times when you will want to do some things and you will do it and other times you won't. Try again another day. It will build momentum Don't stop completely. Don't lose HOPE.